Qingyi-KDA is a 0.6B-parameter hybrid linear-attention language model that successfully converts Qwen3-0.6B-Base into a KDA-based architecture, achieving the smallest publicly released trained KDA model with a stable persona baked into weights.

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License

Apache-2.0

Last updated

2026-07-30

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FR-AI / ANALYSIS

Why it is worth attention

It is the first successful Qwen3→KDA linearization (previous attempts reported divergence), the smallest sub-1B KDA model with practical language ability, and the first open-source linear-attention model with a fully baked persona, all trained on a single consumer GPU.

Who it is for

  • Researchers in efficient transformer architectures and linear attention
  • Developers needing small, fast conversational AI with low memory footprint
  • Hobbyists exploring model distillation and hybrid attention on consumer hardware
  • Open-source community interested in reproducible Qwen3-to-KDA conversion pipelines

Use cases

  • Running a lightweight chat assistant on edge devices or low-resource GPUs
  • Studying and extending hybrid attention (GQA+KDA) for language modeling
  • Prototyping persona-driven chatbots without requiring system prompts

Strengths

  • First successful conversion from Qwen3 to KDA, overcoming documented convergence failure
  • Smallest publicly available trained KDA model (0.6B) with practical conversational ability
  • End-to-end linearization on a single RTX 4070 Laptop 8GB, demonstrating feasibility for consumer hardware
  • Persona alignment without system prompt, with privacy extraction audit showing no real-name leakage

Considerations

  • 0.6B capacity limits: long responses may repeat, factual reliability is weak, general knowledge is limited
  • Trained on group-chat ChatML format; bare QA format is out-of-distribution, degrading performance
  • Persona data includes adult content; model may generate NSFW text and requires appropriate usage context

README quick start

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Description

QINGYI-KDA-0.6B: first successful Qwen3-to-KDA linearization (3:1 hybrid, GQA+RoPE kept layers) + persona alignment. Smallest trained KDA model, converted end-to-end on a consumer 8GB GPU.

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